Injector for forcing hot air.



Patented lune l8, l90l.

L. 0. BOEING.

INJECTOR FOR FORCING HUT AIR.

(Application filed Aug. 28, 1899.)

(No Model.)

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ATENT LEO OTTO BOEING, OF VALLENDAR, GERMANY.

INJECTOR FOR FORCING HOT AIR.

SPECIFICATION forming part of Letters Patent N 0. 676,673, dated June18, 1901.

Application filed August 28,1899. Serial No. 728,785. (No model.)

To all whom, it may concern:

Be it known that I, LEO Orro BOEING, a subject of the King of Prussia,German Em peror, residing at Vallendar, in the Kingdom ofPrussia, andGerman Empire, have invented certain new and useful Improvements inInjectors for Forcing Hot Air, (for which I have applied for a patent inGermany, dated January 2, 1899, and in Austria, dated July 28, 1899,) ofwhich the following is a specification.

The object of my invention is to provide an improved injector forforcing hot air to pro-. mote combustion and for other purposes.

The essential feature of the invention consists in the form andarrangement of the nozzles, which are prismatic or cylindrical andarranged in such a manner one in the other that the front end or mouthof each separate nozzle corresponds with the circumference of animaginary cone having its base at the mouth of the injector, whereas theback or inlet end of each nozzle is arranged in the same plane or aslight distance from the outlet end of the next and smaller nozzle.

On the accompanying drawings,illustrating this invention, Figure 1 is alongitudinal section illustrative of my invention, and Fig. 2 is across-section from which the arrangement of the separate nozzles in eachother will be apparent.

A steam-jet e is arranged in the middle at the inlet end a of theapparatus. The nozzles I, II, and III are of prismatic or cylindricalform, thus having parallel walls throughout their length; and arearranged behind each other in such a manner that the outlet-opening c ofeach nozzle corresponds with the circumference of the cone (1, formed bythe issuing steam. The back orinlet end of each nozzle is situated inthe same plane or a short distance in front of the fore or outlet end ofthe next nozzle of smaller diameter. In such a construction the surfacesubjected to friction by the air is reduced to a minimum, and theresistance offered by the rarefied air to the sucking action of thesteam is reduced to a minimum. The steam-jet spreads out after issuingaccording to its pressure and forms a cone with a greater or less basein proportion to its unit length.

The nozzles are held by distance-bolts 6, arranged at suitable points,as shown in the drawings.

The operation of the apparatus may be considered as follows: Steamissuing under a cer tain pressure and with a given velocity enters thesmallest nozzle I, by which it is conducted for a certain distance, thenexpands into the second nozzle, by which it is further conducted, and soon, exercising a very powerful suc tion action upon the hot air of 600to 1,800".

By reason of the fact that the nozzles I II III have their wallsparallel through their ene tire length annular passages having parallelWalls are provided between the various nozzles through which the hot airis drawn in and forced through the injector. The hot air thereforepasses through the injector in straightlines and is not deflected, andthereby forced against the side walls of the various nozzles; as wouldbe the case if the nozzles were conical. By this construction air at atemperature of from 600 to 1,800 centigrade may be safely forced throughthe injector Without danger of burning out the Various nozzles thereofeven when the latter are constructed of sheet-iron.

By the use of the term cylindrical as usedin the following claim Idesire to be understood that I contemplate anozzle which is ofcylindrical form or one which is of pris matic form.

\Vhat I claim, and desire to secure by Letters Patent of the UnitedStates, is

The herein-described injector for forcing hot air, consisting of aplurality of concen trically-arranged inj ector-nozzles whose walls areparallel throughout their lengths, and a steam-inlet pipe concentricallyarranged with relation to the inlet end of the innermost nozzle, theoutermost injector-nozzle being extended the entire length of saidinjector and the several nozzles being disposed one within another insuch manner that the outlet end of each nozzle corresponds with thecircumference of a cone formed by the issuing steam in expanding throughthe successive nozzles toward the mouth of the injector, substantiallyas specified.

In testimony whereof I have hereunto set my hand in the presence of twowitnesses.

WOLDEMAR HAUPT, HENRY HASPER.

